求如图所示的交变电流的有效值,其中每个周期的后半周期的图象为半个周期的正弦曲线(

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问题:

求如图所示的交变电流的有效值,其中每个周期的后半周期的图象为半个周期的正弦曲线(   )

A.5A

B.5A

C.5/2A

D./2A

考点:交变电流的周期和频率交变电流的最大值、有效值、瞬时值和平均值
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Software quality assurance is now an emerging sub - discipline of (36) . As Buckly and oston point out, (37) software quality assurance is likely to lead to an ultimate (38) of software costs. However, the major hurdle in the path of software management in this area is the lack of usable software (39) . The development of accepted and generally applicable standards should be one of the principal goals of (40) in software engineering.

A.software engineering

B.software design

C.coding

D.testing

题型:选择题

某公司从澳人利亚进口一批羊毛,在韩国转船后运抵我国,报检不需提供( )。

A.进境动植物检疫许可证
B.澳大利亚官方出具的检疫证书
C.关于包装的证书或声明
D.产地证书

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慢性腹泻是指病程超过

A.1个月
B.2个月
C.3个月
D.半年
E.1年

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CRTSI型板式无砟轨道结构由钢轨、()、轨道板、水泥乳化沥青砂浆充填层(CA砂浆)、混凝土底板座、凸型挡台及其周围填充树脂等部分组成。

题型:选择题

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